2009 Infiniti M45 Sedan Review | Edmunds.com

2009 Infiniti M45 Sedan

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Certified Pre-Owned (CPO) is a category of used car. Often late-model vehicles, they have been inspected, refurbished, if necessary, and are under warranty by the manufacturer.
Infiniti M45 Features and Specs

Features & Specs

  • Engine 4.5 L V 8-cylinder
  • Drivetrain Rear Wheel Drive
  • Transmission 5-speed Automatic
  • Horse Power 325 hp @ 6400 rpm
  • Fuel Economy 16/21 mpg
  • Bluetooth Yes
  • Navigation No
  • Heated Seats Yes

Review of the 2009 Infiniti M45

  • Blending high technology with luxury and performance, the 2009 Infiniti M45 continues to be a contender in the luxury sport sedan market.

  • Safety
  • Pros

    Impressive V8 power, adept handling, comfortable and handsome interior, long list of luxury features, available all-wheel drive.

  • Cons

    Noisy highway ride, non-intuitive center stack controls.

  • What's New for 2009

    The Infiniti M45 heads into 2009 without any significant changes.

Full 2009 Infiniti M45 Review

What's New for 2009

The Infiniti M45 heads into 2009 without any significant changes.


Luxury sport sedans have long been the exclusive stomping ground for the high-end European manufacturers. Challengers from Asia have managed to chip away at this market segment over the years, thanks to a steady evolution of better products. For a prime example, look no further than the 2009 Infiniti M45.

The V8-powered M45 offers performance and luxury comparable to that of the venerable German marques, all while sparing a healthy amount of cash from the bottom line. The midsize Infiniti also delivers an astounding amount of technology that enhances nearly every aspect of the driving experience. Adding to the appeal is the availability of the all-wheel-drive M45x.

With the M45's smaller-engined M35 stablemate arriving on the scene this year with a reworked V6 power plant, a sibling rivalry seems inevitable. The M35 now produces more than 300 horsepower and exhibits nearly identical handling prowess, so the dividing line within the M line has been blurred. As it stands, either of these Infiniti Ms proves worthy of consideration against stalwart luxury sedans like the BMW 5 Series and Mercedes-Benz E-Class as well as other desirable entries like the Jaguar XF and Lexus GS.

Body Styles, Trim Levels, and Options

The 2009 Infiniti M45 is a midsize luxury sport sedan available in two well-equipped trim levels. The base model M45 and the all-wheel-drive M45x have standard features that include 18-inch alloy wheels, adaptive xenon headlights, a sunroof, keyless ignition and entry, leather upholstery, 10-way power front seats with heating and cooling, driver-seat memory settings, dual-zone automatic climate control, Bluetooth and a six-speaker audio system with a six-CD/MP3 changer and an auxiliary audio jack.

Options are grouped into packages with slight variations between the M45 and M45x. The Sport package, which is not available on the G45x, includes 19-inch alloy wheels with high-performance tires, sport body styling, rear active steering, a stiffer sport-tuned suspension, aluminum trim that replaces the standard wood accents and sport seats with added side bolstering. The technology package adds a hard-drive-based navigation system, an upgraded eight-speaker Bose sound system with a 9GB music server, a rearview camera, iPod connectivity and voice-activated controls. An advanced technology package can be added that includes a premium 14-speaker surround sound system, a lane departure warning system and adaptive cruise control.

A mobile entertainment system is available in conjunction with all previous packages, but only for rear-wheel-drive M45s. This package basically consists of a rear entertainment system. Finally, a premium package is available that includes all of the previous packages (minus the sport package) and adds heated and reclining rear seats, rear air-conditioning and audio controls, and a power rear sunshade.

Powertrains and Performance

The 2009 Infiniti M45 is powered by a 4.5-liter V8 that cranks out 325 hp and 336 pound-feet of torque. The standard transmission is a five-speed automatic featuring manual shift control and rev-matched downshifts. Fuel economy comes in at an EPA-estimated 16 mpg city/21 mpg highway and 18 mpg in combined driving. The M45x drops slightly to 14/20/16 mpg.


The Infiniti M45 comes standard with antilock disc brakes with brake assist, stability and traction control, front-seat side airbags, full-length side curtain airbags and active front head restraints. The advanced technology package adds safety features including an advanced lane departure warning system that alerts the driver of unintended lane drifting, then applies light brake pressure to specific wheels to maintain lane placement. Also included is an array of sensors that detect an impending crash and tighten the seatbelts. The Insurance Institute for Highway Safety gives the M45 its highest mark of "Good" for frontal and side impacts.

Interior Design and Special Features

Infiniti's M45 has a spacious cabin that comfortably seats four adults. Materials quality is first-rate, with rich leather and pleasing wood appointments. Even in base trim, the front seats are firm and supportive, with plenty of power-adjustable settings. Opting for the Sport package enhances the M's athletic nature by adding racier seats with more aggressive side bolstering and race-inspired accents throughout the cabin. The gauges are bright and legible, but the center stack controls are a bit busy, with a dizzying array of buttons. Even so, you'll probably find them easier to operate than some of the menu-based systems on German luxury sedans.

Driving Impressions

The 2009 Infiniti M45, with its potent V8, provides plenty of power for most drivers. Considering the M45's superb handling capabilities, the ride quality is surprisingly comfortable and compliant -- though some with a penchant for full-luxury cars may find it a bit harsh, especially when equipped with the sport package. On the open highway, road noise is kept to acceptable levels, but the M45 is not as silent as a competing BMW 5 Series or Mercedes E550.

What Others Are Saying

Customer Reviews

Rear clunk

by on
Vehicle: 2008 Infiniti M45

Love the car but I have a clunking noise coming from the rear of the car. Infiniti knows about this & it's been with the M series since 2006. They say its "unfixable". WHAT??? I am very displeased with the way Infiniti is handling this problem and plan to take it to the fullest, if it should come to that.

Not as flashy but just

by on
Vehicle: 2008 Infiniti M45

Traded in a 09 Maxima for the 08 Infiniti M45X. I test drove the 08 G37 and a 08 BMW 550. The G 37 actually drives better but I figured I would get the top of the line and go with the M. The car does not turn heads but as the other reviewer put it, you get pampered when you get inside. I had a Maxima prior to this so I understand all the gadgets. Everything is laid out well. It has great power, you will not get embarrassed on the acceleration lane and on a smooth road you cant tell the difference between 65 and 85. The surround sound is like a concert hall. Around town the ride is a little bouncy, you will feel most bumps in the road and the M goes through gas.

Good solid vehicle

by on
Vehicle: 2008 Infiniti M45

I traded in a 2009 Maxima for the 2008 M45X (new). This is a very nice luxury vehicle. It has all the toys inside that the BMW 5 series has. The smart cruise control is awesome. This vehicle accelerates very quick. This car is a keeper. It is not a head turner. I think the goodies inside with all the electronic gadgets you get to play with is where you get your monies worth out of 2008 M45X. The surround sound is awesome. Pretty quiet ride, not as smooth on rough roads as I was expecting. On the highway you cannot tell the difference between 75 and 90 mph. Simply a well built machine. I had buyers remorse initially but the car has won me over, this car is a keeper!

Sold on infiniti

by on
Vehicle: 2008 Infiniti M45

I purchased a 2008 M45 Sport in December. It was "used" with 3,700 miles and includes the Sport, Tech and Advanced Tech packages, which are just about everything you'll need unless you are shuttling around some very special friends. (The only thing it's missing is the reclining, heated rear seats... boohoo.) I looked at dozens of cars before finding this one at an incredible deal. Giving up a Porsche 911, I wanted power... check. I also wanted something luxurious... check. All without making me feel like I should be twice my age in order to drive it... that's where the Sport Pkg comes in. This car handles incredibly well for something this big and the acceleration nearly matches my 911.

Love it and for the

by on
Vehicle: 2008 Infiniti M45

I leased mine with a two year contract. At the end of the lease, I am very happy with the car. It has good acceleration, its comfortable and its stylish but not over the top. It doesn't attract too much attention but when I sit inside I feel pampered. Good features are ride and technology. Bad features are gas mileage and noise level.

1 of 1 people found this review helpful

Best car ever owned.

by on
Vehicle: 2008 Infiniti M45

The 2008 M45x is one of the most luxurious and best handling sedans in this category. It may not be the best in every category but the combination of luxury, performance and features is excellent.

Talk About The 2009 M45

2009 Infiniti M45 Discussions See all Started By

HI, I'm new here and I am going to be purchasing a brand new M45 but I want to know, does anyone know what updates will be made for the 2009 M45 and when it will possible go on sale. I have been heari...

Infiniti just announced today an additional $1000 Bonus Cash on all M's (M35 or M45 - 2009 or 2010). You can use this money with special rates or lease!...

Ultimately, this led to my cash offer price (with standard financing) on a fully loaded (negatively perceived V8) 2008 M45s for a little over $40K....

Gas Mileage


  • 16
  • cty
  • 21
  • highway
Calculate Yearly Fuel Costs
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